A medical student from Karachi used Gemini for three weeks before her anatomy midterm, asking it to explain topics and generate summaries, but scored lower than in previous years. The article explains that reading AI explanations is passive studying, whereas a study in *Science* by Roediger and Karpicke found that students who tested themselves retained "50% more information a week later" than those who studied the same material again. The exam preparation Gem is a saved configuration of Gemini with permanent instructions that turns it into an examiner, not a teacher; it quizzes you, exposes blind spots, and runs timed mock tests based on your syllabus. Setup takes "15 minutes," and the difference in test results shows up "within a week." The method was built and tested across four subjects and three different exam types over eight weeks.